Steam boiler



March 14, 1944. a. .1. KIMBEL STEAM BOILER Filed on. 22. 1941 3 Sheets-Sheet 1 Ill/culmay r/ZZM Zz'mZreZ Y arch 14, 1944. KlMBEL 2,343,907

STEAM 1301mm Filed Oct. 22, 1941 s Sheets-Sheet 2 Inventor- March 14, 1944. G. J. KlMBEL STEAM BOILER Filed 0ct. 22, 1941 3 Sheets-Sheet 5 Guy 572 fl z'mbez Inventor A ttorney Patented Mar. 14, 1944 UNITED STATES PATENT OFFICE STEAM BOILER Guy John Kimbel, Philadelphia, Pa. v Application October 22, 1941, Serial No. 416,102 7 (Cl. 236-26) 4 Claims.

The present invention relates to new and useful improvements in steam boilers and has for its primary object to provide means for automatically controlling the feeding of fuel to the boiler for generating the steam.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference bein had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout and in which:

Figure 1 is a view in elevation showing the side of the boiler provided with the hopper for feeding the fuel thereto.

Figure 2 is a similar viewshowing the side of the boiler equipped with the control contact.

Figure 3 is a vertical sectional view through the boiler.

Figure 4 is a top plan view.

Figure 5 is a sectional view taken substantially on a line 5-5 of Figure 3, and

Figure 6 is a diagram showing the electric circuit for controlling the blower and fuel feed device for the boiler.-

Referring now to the drawings in detail wherein for the purpose of illustration I have'disclosed a preferred embodiment of the invention, the numeral 5 designates the steam heating chamber which may be of cylindrical or other cross-sectional shape and supported on legs 6. The bottom of the chamber is designated at l and extending below the bottom 1 and welded thereto is an annular member 8 forming an upper combustion chamber section within which is telescopically arranged an annular intermediate combustion chamber section 9 and within said section 9 i arranged an annular lower combustion chamber section it likewise having telescopic fit in the intermediate section 9. A pin 9' projects from the outer surface of the member 9 adjacent its upper edge for engagement in a vertical groove 3' in the upper member 8, and a pin 9 projecting from the inner surface of the member 9 engages a vertical groove 6' in the lower member to connect the members for telescoping movement. v

Secured to the bottom of the lower section H] is a hollow burner-supporting base H having a cup-shaped burner l2 positioned therein with its upper open end communicating with the combustion chamber [3 formed by the sections 8, 9 and I 0, as shown to advantage in Figure 3 of the drawings.

The burner 12 includes a fuel chamber into which the powdered fuel I4 is adapted to be fed,

the burner having a screw conveyor 15 mounted vertically in its bottom portion for feeding the fuel upwardly in the burner from a feed pipe l6 communicating with one side of the burner and extending outwardly of the supporting base ll. The conveyor I5 is attached to a shaft ll which extends through the bottom of the burner and is provided with a gear l8 engaged by a pinion |9 driven by an electric motor 20 mounted inthebasell.

The feed pipe I6 is connected to a hopper 2i secured to the side of the chamber 5 by means of a flexible hose 22 .the fuel being fed to the pipe it from the hopper by gravitation.

The walls of the burner l2 are provided with passages 23 communicating atone end with the burner adjacent it upper portion and having connected thereto a blower 24 driven by an electric motor 25 for forcing air through the passages 23 upwardly through the fuel It.

The base i l and the telescoping fire-pot sections 9 and I 0 are supported in a suspended position by means of rods 26 extending upwardly from the base at diametrically opposite sides thereof and have pivotally connected at their upper ends one end of a pair .of bell-crank levers 21-21 which are pivoted on brackets 28-28 at the intermediate portion of the bell-crank levers. To the opposite ends of the bell-crank levers are pivotally attached links 29- 429 which extend upwardly and are pivotally attached at their upper ends to a crossarm-3H supported on a bracket 3] attached to the top of the chamber 5 by means of upstanding bolts 32--32 on which the ends of the brackets 3| are slidably mounted, each of the bolts having coil springs 33-33 mounted thereon for yieldably urging the bracket in a downwardly extended position.

A cylinder 34 rises from the top of the chamber 5 in communication therewith and in which is a piston 35 having a stem 35 projecting upwardly through the top of the cylinder and connected to the cross-arm 30.

One of the rods 26 is formed with a plurality of vertically spaced recesses 31 adapted for adjustably receiving a terminal 38 carried by a contact 39 slidably mounted on the rod and disposed in the path of a similar contact Ml mounted on a bracket 4| secured to the adjacent side of the chamber 5. The bracket 4| is provided with a stop 42 on which the contact is adapted to seat, the contact being yieldably held in its downwardly disposed position by a spring 43 mounted on the bracket.

Circuit wires 44 and 45 lead from the contacts 39 and 4! to a, suitable source of current, the circuit wires 45 having the motors 20 and 25 interposed therein.

Also attached to one side of the chamber is a water gauge 46 and in the top of the chamber is provided a filling pipe 4'! for supplying the chamber 5 with a predetermined quantity of water 48.

The top of the cylinder 34 is provided with a vent pipe 49. r v

In the operation of the device, the springs 33 normally urge the brackets 3!, the cross-arm 30 and the piston 35 downwardly thereby raising the contact 39 upwardly through the connection thereof by the links 21 and 29 and the circuit for the motors and 25 will accordingly be closed for feeding the fuel into the combustion chamber where it is burned. to generate heat under the chamber 5 and generate steam therein. As a predetermined pressure of steam is gen erated in the upper portion of the chamber 5, the piston 35 will be forced upwardly, thus moving the rods 26 downwardly and breaking the connection between the contacts 39 andllll and thus interrupting the further feeding of fuel to the burner.

The pressure of steam generated in the boiler also regulates the position of the burner relative to the boiler to increase or decrease the effectiveness of the burner.

The burner is designed to use powdered, pretreated or smokeless coal which is substantially completely consumed, thus permitting the use of a relatively small vent pipe 50 for the combustion chamber. An inspection and clean-out door 5| is also provided in the upper combustion chamber section 8.

It is believed the details of construction and manner of use of the device will be readil understood from the foregoing without further detailed explanation.

Having thus described th invention what is claimed is:

1. A boiler comprising a steam generating chamber, a cylinder communicating with the chamber, having a piston therein responsive to predetermined pressure of steam in the chamber, a burner, means connecting the burner to the piston for suspending the burner beneath the chamber for vertical adjustment of the burner relative to the chamber in" accordance with variations in the pressure'of steam in the chamber, electrically operated feed means for theburner,

burner.

and switch means for said feed means controlled by the movement of said piston.

2. A boiler comprising a steam generating chamber, a cylinder communicating with the chamber, having a piston therein responsive to predetermined pressure of steam in the chamber, a burner, means connecting the burner to the piston for suspending the burner beneath the chamber for vertical adjustment of the burner relative to the chamber in accordance with variations in the pressure of steam in the chamber, electrically operated feed means for the burner, and switch means for said feed means carried by the burner connecting means and actuated upon a predetermined movement of the piston.

3.' A boiler comprising a steam generating chamber, an expansible combustion chamber beneath the steam chamber and including a movable bottom section, a burner carried by said movable section of the combustion chamber for adjustment vertically relative to the steam chamber, pressure-responsive means communicating 'withthe steam chamber, rods rising from the movable section of the combustion chamber, means connecting the rods to the pressure-responsive means, motor-driven fuel feed means for the burner, and switch means for the motor carried by the rods and arranged for opening and closing movement upon a predetermined movement of the rods.

4. A boiler comprising a steam generating chamber, an expansible combustion chamber beneath the steam chamber and including a movable bottom section, a burner carried by said movable section of the combustion chamber for adjustment vertically relative to the steam chamber, pressure-responsive means communicating with the steam chamber, rods rising from the movable section of the combustion chamber, means connecting the rods to the pressure-responsive means, motor-driven fuel feed means for the burner, and switch means for the motor carried by the rods and arranged for opening and closing movement upon a predetermined movement of the rods, said switch means including a movable contact carried by one of the rods, and a contact carried by the steam chamber in the path of the movable contact, said second named contact being movable with the movable contact during a predetermined upward movement of the GUY JOHN KIMBEL. 

